Partly added VAAPI support

 - Encoding is not possible in order to some bugs in the QtAV library

VanadiumCast/VanadiumCast.pro

@@ -18,6 +18,8 @@ win32 {
 
 unix {
     LIBS += ../backend/libbackend.so -lQtAV -lQtAVWidgets
+    QMAKE_LFLAGS_RPATH=
+    QMAKE_LFLAGS += "-Wl,-rpath,\'\$$ORIGIN\'"
 }
 
 CONFIG += c++20

VanadiumCast/res/gui/fragments/PageMedia.qml

@@ -114,7 +114,7 @@ Page {
             anchors.topMargin: 8
             height: 1280
             width: 720
-            videoCodecPriority: ["QSV", "DXVA", "MMAL", "CUDA", "FFMPEG"]
+            videoCodecPriority: ["VAAPI", "QSV", "DXVA", "MMAL", "CUDA", "FFMPEG"]
             audioBackends: ["OpenAL", "XAudio2", "null"]
             Component.onCompleted: console.log(previewVideo.audioBackends)
             smooth: true
@@ -275,6 +275,6 @@ Page {
         id: startStreamBtn
         text: qsTr("Stream")
         enabled: false
-        onClicked: previewVideo.stop()
+        onClicked: previewVideo.pause()
     }
 }

backend/backend.pro

@@ -15,7 +15,9 @@ win32 {
 }
 
 unix {
-    QT += av avwidgets
+    LIBS += -lQtAV -lQtAVWidgets
+    QMAKE_LFLAGS_RPATH=
+    QMAKE_LFLAGS += "-Wl,-rpath,\'\$$ORIGIN\'"
 }